Telescoping atrial septum needle

Abstract

Devices used to provide transseptal access are disclosed. The devices may comprise at least one cannula, a needle, and a handle. The cannula and the needle may be configured to be inserted through a dilator while not damaging a lumen wall of the dilator. The handle may be configured to lock the needle in a retracted position. The devices may be configured to telescopically advance the needle through an atrial septum.

The invention claimed is: 
     
       1. A telescoping needle assembly, comprising:
 an outer cannula; 
 a needle telescopically disposed within the outer cannula; 
 a handle operatively coupled to the outer cannula and the needle, wherein the handle comprises a locking member configured to lock the needle in a retracted position; and 
 a middle cannula telescopically disposed within the outer cannula, wherein the needle is telescopically disposed within the middle cannula, 
 wherein when the locking member is displaced proximally, the locking member unlocks the needle from the retracted position and is configured to distally displace the needle and the middle cannula to an extending position, and 
 wherein a distal portion of the needle and a distal portion of the middle cannula extend beyond a distal end of a dilator. 
 
     
     
       2. The telescoping needle assembly of  claim 1 , wherein distal ends of the outer and middle cannulae are blunt. 
     
     
       3. The telescoping needle assembly of  claim 1 , wherein a distal end of the needle is sharp. 
     
     
       4. The telescoping needle assembly of  claim 1 , wherein the outer cannula has an arcuate shape adjacent a distal end portion. 
     
     
       5. The telescoping needle assembly of  claim 1 , wherein the outer cannula comprises a spiral cut. 
     
     
       6. The telescoping needle assembly of  claim 1 , wherein the middle cannula comprises a spiral cut. 
     
     
       7. The telescoping needle assembly of  claim 1 , wherein when the needle is in the retracted position a distal end of the needle does not extend beyond a distal end of the outer cannula. 
     
     
       8. The telescoping needle assembly of  claim 1 , wherein when the needle is in the retracted position a distal end of the needle does not extend beyond a distal end of the middle cannula. 
     
     
       9. The telescoping needle assembly of  claim 4 , wherein a distal end of the needle is constrained away from a dilator lumen wall when the needle is inserted into a dilator lumen. 
     
     
       10. The telescoping needle assembly of  claim 1 , wherein the locking member is configured to axially displace the needle and the middle cannula to an extending position, and
 wherein a distal portion of the needle and a distal portion of the middle cannula extend beyond a distal end of a dilator. 
 
     
     
       11. The telescoping needle assembly of  claim 1 , wherein the handle is configured to axially displace the needle and the middle cannula to an extending position, and
 wherein a distal portion of the needle and a distal portion of the middle cannula extend beyond a distal end of a dilator. 
 
     
     
       12. The telescoping needle assembly of  claim 1 , wherein the locking member provides tactile and audible feedback when changing from a locked state to an unlocked state. 
     
     
       13. The telescoping needle assembly of  claim 1 , wherein the locking member comprises a resilient member configured to retain the locking member in a locked state. 
     
     
       14. A method of performing an atrial transseptal access, comprising:
 inserting a dilator and a sheath into a heart of a patient, wherein a distal end of the dilator is positioned against an atrial septum; 
 obtaining a telescoping needle set, comprising: an outer cannula;
 a middle cannula telescopically disposed within the outer cannula; a needle telescopically disposed within the middle cannula; and 
 a handle operatively coupled to the outer cannula, the middle cannula, and the needle; 
 
 inserting the telescoping needle set into a lumen of the dilator, wherein the handle is configured to lock the needle in a retracted position, wherein a distal end of the needle is disposed within the middle cannula; 
 unlocking the handle; 
 advancing the needle through the atrial septum; and 
 advancing a distal end of the middle cannula through the atrial septum. 
 
     
     
       15. The method of  claim 14 , wherein the handle comprises a locking member. 
     
     
       16. The method of  claim 14 , wherein the needle is advanced through the atrial septum by distal displacement of the handle. 
     
     
       17. The method of  claim 15 , wherein the needle is advanced through the atrial septum by distal displacement of the locking member. 
     
     
       18. The method of  claim 15 , wherein unlocking the handle comprises depressing the locking member. 
     
     
       19. A telescoping needle system, comprising: a dilator;
 a first elongate member; 
 a second elongate member telescopically disposed within the first elongate member; 
 a needle telescopically disposed within the second elongate member; and 
 a handle operatively coupled to the first and second elongate members and the needle, 
 wherein the handle comprises a locking member that is configured to lock the needle in a retracted position, wherein a sharp distal end of the needle is disposed within the second elongate member, 
 wherein when the locking member is displaced proximally, the locking member unlocks the needle from the retracted position and is configured to distally displace the needle and the second elongate member to an extending position, and 
 wherein a distal portion of the needle and a distal portion of the middle cannula extend beyond a distal end of a dilator. 
 
     
     
       20. The telescoping needle system of  claim 19 , wherein the sharp distal end of the needle is configured to not skive a lumen wall of the dilator when the needle is inserted into a lumen of the dilator. 
     
     
       21. The telescoping needle system of  claim 19 , wherein the handle is configured to advance the needle to the extending state.